Malicious PDF — malware analysis report

Static analysis result for SHA-256 be939036232b571d…

MALICIOUS

PDF

82.0 KB Created: 2021-03-18 08:07:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bd069c6193402f0e09057191f2f8b180 SHA-1: 2387b90b4534ea460505c2978e5370427f0f5d97 SHA-256: be939036232b571d45450471f7c802450c3424ee2e0fbde44198d7ca44043fae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a significant portion pointing to disposable hosting and link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation method and potential purpose as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/award?keyword=manual+aviones+de+papel+pdf PDF link annotation
    • http://peluxuba.sportsontheweb.net/51655411306.pdfIn PDF document text
    • http://femonejigajape.mywebcommunity.org/physical_science_curriculum_guide_deped.pdfIn PDF document text
    • http://paselon.getenjoyment.net/xazexewibesupixidolasog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503533/normal_6052d58435479.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/kubota_gas_engine_parts_lookup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406787/normal_603e93cc039f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460231/normal_604ee2fa05300.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501634/normal_6001e1522755e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414689/normal_604aba23d7667.pdfIn PDF document text
    • http://zukirudon.mypressonline.com/30_day_green_smoothie_cleanse_results.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_d7496349bd4b4b32b814ca82f2e22c03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b9536a-f608-4a90-be9e-971d8f7ec47d/warhammer_40k_first_strike_starter_set_review.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/33349684445.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb7c4730-c1e0-49ac-86af-9fa82b66be9f/poxaxulesox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5a33cf6-dabe-43e5-b572-a0ac405d9441/fibazawutemijim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c4cbcf7-51d8-4b86-a05d-6528d01f1333/what_caliber_is_needed_to_kill_an_elephant.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/ncert_exemplar_class_12_biology_book.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/chelsea_fc_match_report_today.pdfIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_fe74e652b41b498a80ff866b4c056b15.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af8cb8e-a599-4a66-a2de-cd1721d19b5e/dixuraloxilu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 5004 bytes
SHA-256: 70c2318c0a13468cb019bbe30a565796f4b8e52d68b80779cde8ba33638f2f70
font_01_sfnt_off0000fc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 11676 bytes
SHA-256: aaea5b480e3439b0ff9c36c1a95835a34a57908aa32fd9b9d10e06585fb1184b
font_02_sfnt_off000122dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939